I’m shocked that nobody seems to care about this. “Keyword not defined” is now the new rule for google. It seems only searches from mobiles still return keywords in url, hence keywords useful for Piwik. Searches from computer return an url with coded parameters.
Are the personal of Piwik interested to decode those urls? Are advanced users, programmers, interested in decoding google’s urls? Otherwise, there will be a bitter end of all other web analytics, except Google Analytics.